cidr_table(5)
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CIDR_TABLE(5) CIDR_TABLE(5)
NAME
cidr_table - format of Postfix CIDR tables
SYNOPSIS
postmap -q "string" cidr:/etc/postfix/filename
postmap -q - cidr:/etc/postfix/filename <inputfile
DESCRIPTION
The Postfix mail system uses optional access control tables. These
tables are usually in dbm or db format. Alternatively, access control
tables can be specified in CIDR (Classless Inter-Domain Routing) form.
To find out what types of lookup tables your Postfix system supports
use the postconf -m command.
To test lookup tables, use the postmap command as described in the SYN-
OPSIS above.
TABLE FORMAT
The general form of a Postfix CIDR table is:
network_address/network_mask result
When a search string matches the specified network block, use
the corresponding result value. Specify 0.0.0.0/0 to match every
address.
network_address result
When a search string matches the specified network address, use
the corresponding result value.
blank lines and comments
Empty lines and whitespace-only lines are ignored, as are lines
whose first non-whitespace character is a `#'.
multi-line text
A logical line starts with non-whitespace text. A line that
starts with whitespace continues a logical line.
SEARCH ORDER
Patterns are applied in the order as specified in the table, until a
pattern is found that matches the search string.
EXAMPLE SMTPD ACCESS MAP
/etc/postfix/main.cf:
smtpd_client_restrictions = ... cidr:/etc/postfix/client.cidr ...
/etc/postfix/client.cidr:
# Rule order matters. Put more specific whitelist entries
# before more general blacklist entries.
192.168.1.1 OK
192.168.0.0/16 REJECT
SEE ALSO
postmap(1), Postfix lookup table manager
regexp_table(5) format of regular expression tables
pcre_table(5) format of PCRE tables
README FILES
Use "postconf readme_directory" or "postconf html_directory" to locate
this information.
DATABASE_README, Postfix lookup table overview
AUTHOR(S)
The CIDR table lookup code was originally written by:
Jozsef Kadlecsik
kadlec@blackhole.kfki.hu
KFKI Research Institute for Particle and Nuclear Physics
POB. 49
1525 Budapest, Hungary
Adopted and adapted by:
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
CIDR_TABLE(5)
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